Generate a new version and update production

[carlosbello]

At the moment we have a not PHP 7.x compatible version running in production. The 6.x version is no longer supported so, we have to update the production code with the current form master branch which is PHP 7.x compatible.

[carlosbello]

We should pay attention to this fragment of code inside of config.php and remove it AFAIK since it's the main failure point for the upgrade:

function __autoload($class)
{
    if (true || strpos($class, 'CI_') !== 0) {
        if (file_exists($file = APPPATH . 'core/' . $class . EXT)) {
            include $file;
        } elseif (file_exists($file = APPPATH . 'libraries/' . $class . EXT)) {
            include $file;
        }
    }
}